add seekbar

include/services/dbus/messages.hpp

@@ -4,6 +4,7 @@
 #include <functional>
 #include <string>
 #include <map>
+#include <sys/types.h>
 #include <vector>
 #include "glibmm/variant.h"
 
@@ -13,6 +14,7 @@ struct MprisPlayer2Message {
     std::string title;
     std::string artist;
     std::string artwork_url;
+    uint32_t length_ms;
 
     std::function<void()> play_pause;
     std::function<void()> next;